Responses by Lactating Cows in Commercial Dairy Herds to Recombinant Bovine Somatotropin
نویسندگان
چکیده
منابع مشابه
Fertility of lactating dairy cows administered recombinant bovine somatotropin during heat stress.
Administration of recombinant bovine somatotropin (bST) to lactating dairy cows during heat stress increases milk yield, but it also can increase body temperature and may therefore compromise fertility. However, it is possible that bST treatment could increase fertility during heat stress because it has been reported to increase fertility in lactating cows. In addition, bST increases secretion ...
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The objective of this experiment was to evaluate the effects of bovine somatotropin administration on serum concentrations of glucose, insulin, NEFA, IGF-I, and progesterone (P4) in ovariectomized non-lactating dairy cows receiving exogenous P4, as a model to estimate treatment effects on hepatic P4 degradation. Ten non-lactating, non-pregnant, and ovariectomized Gir Holstein cows were assigned...
متن کاملAn approach to identify dairy cows being responsive to recombinant bovine somatotropin.
Forty-eight primiparous and pregnant Holstein cows at 202 (+/-59) days in milk and average daily milk production (DMP) of 22 (+/-5.3) kg at the beginning of the trial were used to study the possibility of identifying animals that are more responsive to recombinant bovine somatotropin (rbST). Animals were housed in free-stall barns, milked three times a day and fed a total mixed ration. Animals ...
متن کاملEffects of recombinant bovine somatotropin administration to lactating goats
Eight multiparus lactating goats, matched for parity and days in milk were used to evaluate the effects of recombinant bovine somatotropin (rbST) administration on milk yield and composition, as well as on certain metabolic parameters. The experiment was a switch-back design, with three periods lasting 28 days each. Animals were divided into two groups (n 4) and treatments consisted of subcut...
متن کاملEffect of Bovine Somatotropin on the Lactational and Reproductive Performance of Lactating Dairy Cows - a Review
Bovine somatotropin (bST) increases milk production in dairy animals. The maximum increase in milk production has been observed up to 41%. Somatotropin did not change milk composition significantly. During short-term application of bST, cows mobilized their body-reserves to support the increased milk production. Although DM intake of cows was increased in the long-term applications, however, gr...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1991
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(91)78244-1